Mounting solution for 50kg load cells?

I had made a bed occupancy sensor based on 50kg load cells and a HX711.
It worked pretty great for a long time. The issue is that the holder + load cells were not really attached to the bed but just formed a slot where the feet of the bed fit into: [this one](https://www.thingiverse.com /thing:4614359).
But it is not a very stable solution since if I move the bed just the slightest they will move out of place.

So I just wanted to ask if anyone has a good solution on how to attach those load cells (to anything really) in a more robust way?